The data set collected with the ALEPH detector from 1991 to 1995 at LEP has been analysed to measure the charm forward-backward asymmetry at the Z. Out of a total of 4.1 million hadronic Z decays, about 36000 high momentum D(*)(+) D(+) and D(0) decays were reconstructed, of which 80% originate from Z --> <c(c)over bar> events. The forward-backward asymmetry was measured at three energy points: A(FB)(c)(root s = 89.37 GeV) = (-1.0 +/- 4.4)% A(FB)(c)(root s = 91.22 GeV) = (6.3 +/- 1.0)% A(FB)(c)(root s = 92.96 GeV) = (11.0 +/- 3.4)%. From this analysis, a value of the effective electroweak mixing angle sin(2)theta(W)(eff) = 0.2321 +/- 0.0016 is extracted.
The forward-backward asymmetry for charm quarks at the Z
BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;FORTI, FRANCESCO;GIORGI, MARCELLO;MESSINEO, ALBERTO MARIA;RIZZO, GIULIANA;TONELLI, GUIDO EMILIO;
1998-01-01
Abstract
The data set collected with the ALEPH detector from 1991 to 1995 at LEP has been analysed to measure the charm forward-backward asymmetry at the Z. Out of a total of 4.1 million hadronic Z decays, about 36000 high momentum D(*)(+) D(+) and D(0) decays were reconstructed, of which 80% originate from Z -->I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
